package main

import "fmt"

/**
 * @author: guangcheng
 * @date:   2020/11/2 23:17
 * @version  V1.0
 * @description:
 *
 */
func main() {

	var i int
	i = 10
	fmt.Println(i)

	//before
	a := 9
	b := 2
	fmt.Println(a, b) //9 2
	//after
	t := a
	a = b
	b = t
	fmt.Println(a, b) //2 9

	//
	a += 10
	fmt.Println(a) //12

}
